textproc/icu: icu-config needs bash as interpreter on Solaris

[Clausen, Jörn <joern.clausen%uni-bielefeld.de@localhost>]

Sorry for posting this here, but the PR submission form seems to be 
missing at the moment...

icuconfig from textproc/icu returns on Solaris 11.4:

$ icu-config --ldflags
-n  -L/opt/pkg-hrz/20200817/lib -licui18n -licuuc -licudata
<empty line>

instead of

 -L/opt/pkg-hrz/20200817/lib -licui18n -licuuc -licudata

Solaris' /bin/sh does not know "echo -n". The interpreter of icu-config 
should probably be changed to either /bin/bash or some other shell from 
pkgsrc.

--
Jörn Clausen
https://www.uni-bielefeld.de/bits